Replace more ObserverList with base::ObserverList.

ui/display/chromeos/display_configurator.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_DISPLAY_CHROMEOS_DISPLAY_CONFIGURATOR_H_
 #define UI_DISPLAY_CHROMEOS_DISPLAY_CONFIGURATOR_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 371 matching lines @@
   // True if the caller wants to force the display configuration process.
   bool force_configure_;
 
   // Most-recently-used display configuration. Note that the actual
   // configuration changes asynchronously.
   DisplayStateList cached_displays_;
 
   // Most-recently-used framebuffer size.
   gfx::Size framebuffer_size_;
 
-  ObserverList<Observer> observers_;
+  base::ObserverList<Observer> observers_;
 
   // The timer to delay configuring displays. This is used to aggregate multiple
   // display configuration events when they are reported in short time spans.
   // See comment for NativeDisplayEventDispatcherX11 for more details.
   base::OneShotTimer<DisplayConfigurator> configure_timer_;
 
   // Id for next display protection client.
   ContentProtectionClientId next_display_protection_client_id_;
 
   // Display protection requests of each client.
@@ skipping 11 matching lines @@
 
   // This must be the last variable.
   base::WeakPtrFactory<DisplayConfigurator> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayConfigurator);
 };
 
 }  // namespace ui
 
 #endif  // UI_DISPLAY_CHROMEOS_DISPLAY_CONFIGURATOR_H_